Comparative study of the dust particle population sampled during four consecutive campaigns in full-tungsten ASDEX Upgrade

Nikolaus Endstrasser, Volker Rohde, Martin Balden, Paul Humrickhouse, Udo Von Toussaint, Bastiaan J. Braams, Hyun Kyung Chung, Rudolf Neu

Research output: Contribution to journalConference articlepeer-review

23 Scopus citations

Abstract

Scanning electron microscopy images and energy-dispersive x-ray spectra were recorded for a total of about 4×10 4 dust particles collected on the same position within the vacuum vessel via silicon wafers during four consecutive full-tungsten first wall campaigns of ASDEX Upgrade between 2007 and 2009. By careful analysis of the elemental composition and shape of the sampled particles, seven statistically relevant classes of dust were identified. The particle flux and area coverage of each class were normalized to the total plasma duration of each sampling period, revealing a high sensitivity of the dust composition to device conditioning. According to the present results, particles produced by arcing on divertor tiles with delaminated coatings were transported to the main chamber first wall.

Original languageEnglish
Article number014021
JournalPhysica Scripta
VolumeT145
DOIs
StatePublished - 2011
Externally publishedYes
Event13th International Workshop on Plasma-Facing Materials and Components for Fusion Applications, PFMC-13 and 1st International Conference on Fusion Energy Materials Science, FEMaS-1 - Rosenheim, Germany
Duration: 9 May 201113 May 2011

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